Probly want to buy Reason directly from the Propellerheads site. If you're just starting out, I reckon Reason is the cat's pyjamas for teaching you dance music production 101, much moreso than either Acid or Cubase (which is not to say they're not superior in other ways). It's stable, presents all the basic effects and bits and pieces you'll want to learn, and importantly, it doesn't use plugins, which are bad news in a host when you're starting out.*

I assume you're intending to use the DJM for beatmixing (i.e. DJing, which will require decks to go along with it)? You probably won't need it for producing, or if you feel you do need a hardware mixer for producing, get a different mixer, IMO...

*: Why? They crash your machine, they waste your time in collecting trying out irrelevant ones, and they make other people's song files useless if you don't own the same plugins they do...[/url]